Implement HttpUserAgentSettings delegate for Android WebView

android_webview/browser/net/aw_http_user_agent_settings.cc

+// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "android_webview/browser/net/aw_http_user_agent_settings.h"
+
+#include "android_webview/browser/aw_content_browser_client.h"
+#include "android_webview/common/aw_content_client.h"
+#include "content/public/browser/browser_thread.h"
+#include "net/http/http_util.h"
+
+namespace android_webview {
+
+AwHttpUserAgentSettings::AwHttpUserAgentSettings() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  last_aw_accept_language_ =

[Torne, 2015/07/17 13:33:18]

Maybe just do this lazily to avoid duplicating the code?

[ctserng, 2015/07/17 16:51:15]

Will do.

+      AwContentBrowserClient::GetAcceptLangsImpl();
+  last_http_accept_language_ =
+      net::HttpUtil::GenerateAcceptLanguageHeader(last_aw_accept_language_);
+}
+
+AwHttpUserAgentSettings::~AwHttpUserAgentSettings() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+}
+
+std::string AwHttpUserAgentSettings::GetAcceptLanguage() const {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  std::string new_aw_accept_language =
+      AwContentBrowserClient::GetAcceptLangsImpl();
+  if (new_aw_accept_language != last_aw_accept_language_) {
+    last_http_accept_language_ =
+        net::HttpUtil::GenerateAcceptLanguageHeader(new_aw_accept_language);
+    last_aw_accept_language_ = new_aw_accept_language;
+  }
+  return last_http_accept_language_;
+}
+
+std::string AwHttpUserAgentSettings::GetUserAgent() const {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  return android_webview::GetUserAgent();
+}
+
+}  // namespace android_webview